已解决！

因此，在伤了我头6个小时之后，发现了问题.显然，当您使用SSH1创建config.json时，Google会自动创建与此项目关联的Web OAuth2密钥.我注意到的是Google用相同的名称创建了3个项目(一个用于Firebase，一个用于Web，另一个不确定)

So after 6 hrs of breaking my head, found the issue. Apparently when you create config.json using your SSH1 google automatically creates a Web OAuth2 key associated with this project. What I noticed was Google created 3 projects with the same name (one for firebase, one for Web and another not sure)

因此，请获取与同一Android项目链接的Web客户端ID.哦，谷歌！

So grab the Web client ID that is linked with the same Android project. Oh Google!